recycler.cpp

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// Copyright (c) 2000-2001 Brad Hughes <bhughes@trolltech.com>
//
// Use, modification and distribution is allowed without limitation,
// warranty, or liability of any kind.
//

#include "recycler.h"
#include "constants.h"
#include "buffer.h"

#include <iostream>
using namespace std;

Recycler::Recycler(unsigned int sz)
    : add_index(0), done_index(0), current_count(0)
{
    buffer_count = (sz / Buffer::size());
    if (buffer_count < 1) {
        buffer_count = 1;
    }

    buffers = new Buffer*[buffer_count];

    for (unsigned int i = 0; i < buffer_count; i ++) {
        buffers[i] = new Buffer;
    }
}


Recycler::~Recycler()
{
    for (unsigned int i = 0; i < buffer_count; i++) {
        delete buffers[i];
        buffers[i] = 0;
    }

    delete [] buffers;
}


bool Recycler::full() const
{
    return current_count == buffer_count;
}


bool Recycler::empty() const
{
    return current_count == 0;
}


int Recycler::available() const
{
    return buffer_count - current_count;
}


int Recycler::used() const
{
    return current_count;
}


Buffer *Recycler::get()
{
    if (full())
        return 0;
    return buffers[add_index];
}


void Recycler::add()
{
    add_index = ++add_index % buffer_count;
    current_count++;
}


Buffer *Recycler::next()
{
    return buffers[done_index];
}


void Recycler::done()
{
    done_index = ++done_index % buffer_count;
    current_count--;
}


void Recycler::clear()
{
    add_index = done_index = current_count = 0;
}


unsigned int Recycler::size() const
{
    return buffer_count * Buffer::size();
}

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